Add index to filename for existing file (file.txt => file_1.txt)

Question

I want to add an index to a filename if the file already exists, so that I don\'t overwrite it.

Like if I have a file myfile.txt and same time myfile.

Answer 1

Using commons-io:

private static File getUniqueFilename( File file )
{
    String baseName = FilenameUtils.getBaseName( file.getName() );
    String extension = FilenameUtils.getExtension( file.getName() );
    int counter = 1
    while(file.exists())
    {
        file = new File( file.getParent(), baseName + "-" + (counter++) + "." + extension );
    }
    return file
}

This will check if for instance file.txt exist and will return file-1.txt